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Steels for sour service environments

a technology for sour service environments and steels, applied in the field of steel compositions, can solve problems such as catastrophic failures of steels, and achieve the effects of reducing hydrogen permeation and good process control

Active Publication Date: 2012-12-11
TENARIS CONNECTIONS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0008]Embodiments of the present application are directed towards steel compositions that provide improved properties under corrosive environments. Embodiments also relate to protection on the surface of the steel, reducing the permeation of hydrogen. Good process control, in terms of heat treatment working window and resistance to surface oxidation at rolling temperature, are further provided.
[0014]In certain embodiments, the average packet size, dpacket of the steel composition, the precipitate size of the steel composition, and the shape factor of the precipitates are selected to improve the sulfur stress corrosion resistance of the composition. The average packet size, dpacket of the steel composition is less than about 3 μm, the composition possesses precipitates having a particle diameter, dp, greater than about 70 nm and which possess an average shape factor of greater than or equal to about 0.62, and the shape factor is calculated according to 4 Aπ / P2, where A is area of the particle projection and P is the perimeter of the particle projection.

Problems solved by technology

The combination of high strength in the steels and large quantities of hydrogen in H2S environments can lead to catastrophic failures of these steels.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

Influence of Copper Content on the Formation of a Protective Layer Against Hydrogen Uptake

[0088]a) Materials

[0089]Chemical compositions of certain embodiments of the steel composition are depicted in Table 5. Four types of medium carbon (about 0.22-0.26 wt. %) steels with Ti, Nb, V, additions, among others, were examined. The compositions differ mainly in copper and molybdenum additions.

[0090]

TABLE 5Compositions investigated in Example 1SampleCCrMoMnSiPSCuOther10.250.930.450.430.310.0070.0060.02Ti, Nb, B20.271.000.480.570.240.0090.0020.14Ti, Nb, B30.22-0.230.96-0.970.66-0.730.38-0.420.19-0.210.006-0.0090.0010.04-0.05Ti, Nb, B40.24-0.260.90-0.950.67-0.690.500.22-0.300.011-0.0170.001-0.0020.15-0.17Ti, Nb, B50.251.00-1.020.70-0.710.31-0.320.210.09Ti, Nb, V, BSample 1 0.02Cu—0.45Mo; low Cu, low MoSample 2 0.14Cu—0.48Mo; high Cu; low MoSample 3 0.04Cu—0.70Mo; low Cu; high MoSample 4 0.16Cu—0.68Mo; high Cu, high Mo

[0091]b) Microstructure and Corrosion Product Characterization

[0092]The mic...

example 2

Influence of W Content on High Temperature Oxidation Resistance

[0119]Grain growth, tempering resistance, cementite shape factor, oxidation resistance, and corrosion resistance were examined in samples 6C-9, outlined below in Table 6.

[0120]a) Materials:

[0121]

TABLE 6Compositions investigated in Example 2SampleCMnSiNiCrMoWCuPAlTi6C0.241.500.230.120.260.100.120.0200.02070.241.450.220.090.310.030.140.0170.01780.231.440.240.100.270.030.200.12950.0260.01890.241.420.260.110.280.020.400.131000.0280.018Sample 6C Baseline compositionSample 7 Baseline composition with lower MoSample 8 Baseline composition with 0.2 wt. % W replacing MoSample 9 Baseline composition with 0.4 wt. % W replacing Mo

[0122]b) Grain Growth (SEM)[0123]Substantially no differences were detected in the grain size after austenitisation within the temperature range of about 920-1050° C., indicating that grain size is substantially independent of W content.

[0124]c) Tempering Resistance[0125]Substantially no effect on tempering...

example 3

Microstructure and Mechanical Characterization of Further Steel Compositions for Sour Service

[0135]Microstructural examination (SEM), hardness, yield strength, toughness as a function of packet size, precipitation and KISSC were examined in Samples 13C-16, outlined below in Table 7.

[0136]a) Materials

[0137]

TABLE 7Compositions investigated in Example 3SampleCMnCrMoNbVWOther13C0.250.410.980.710.024Ti, B, Al, Si140.250.260.50.740.023Ti, B, Al, Si150.250.190.50.740.0220.15Ti, B, Al, Si160.240.20.510.730.053Ti, B, Al, Si170.250.20.530.730.0310.0310.021Ti, B, Al, SiSample 13C Baseline compositionSample 14 Composition incorporates a decrease in Mn and CrSample 15 Composition incorporates V to induce high precipitation hardeningSample 16 Composition incorporates high Nb to induce high precipitation hardeningSample 17 Composition incorporating W

In certain embodiments, samples were subjected to a hot rolling treatment intended to simulate industrial processing.

[0138]b) Microscopy[0139]Orientat...

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Abstract

Embodiments of the present application are directed towards steel compositions that provide improved properties under corrosive environments. Embodiments also relate to protection on the surface of the steel, reducing the permeation of hydrogen. Good process control, in terms of heat treatment working window and resistance to surface oxidation at rolling temperature, are further provided.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application is a continuation of U.S. patent application Ser. No. 12 / 042,145 filed Mar. 4, 2008, now U.S. Pat. No. 7,862,667B2 entitled “Steels for Sour Service Environments” and incorporated in its entirety by reference herein, which claims the benefit of priority under 35 U.S.C. §119(e) of U.S. Provisional Application No. 60 / 948,418 filed on Jul. 6, 2007, entitled “Steels for Sour Service Environments.”BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]Embodiments of the present disclosure are directed towards steel compositions that provide good toughness under corrosive environments. Embodiments also relate to protection on the surface of the steel, reducing the permeation of hydrogen. Good process control, in terms of the heat treatment working window and resistance to surface oxidation at rolling temperature, are further provided.[0004]2. Description of the Related Art[0005]The insertion of hydrogen into metals has...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): C22C38/22C22C38/24C22C38/28
CPCC22C38/02C22C38/22C22C38/04
Inventor TURCONI, GUSTAVO LOPEZGARCIA, ALFONSO IZQUIERDOFUKUI, TOSHIHIKO
Owner TENARIS CONNECTIONS
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